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长春光学精密机械与物... [1]
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会议论文 [1]
发表日期
2007 [1]
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Fabrication technique of large-scale lightweight SiC space mirror (EI CONFERENCE)
会议论文
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies, AOMATT 2007: Large Mirrors and Telescopes, July 8, 2007 - July 12, 2007, Chengdu, China
Zhang G.
;
Zhao R.
;
Zhao W.
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提交时间:2013/03/25
Silicon carbide (SiC) is a new type candidate material for large-scale lightweight space mirror. Its low thermal distortion
high stiffness
high optical quality
and its dimensional stability are better than other traditional optical substrate materials such as ULE
Zerodure
Beryllium (Be) and so on. In this paper
the lightweight silicon carbide space mirror blank was fabricated by reaction sintering. As a space born mirror material
silicon carbide must be an optical grade ceramic. So we prepared the silicon carbide green body with gel-casting method. Then some carbon materials were supplemented into the green body which will bring reaction-sintering with silicon in a vacuum furnace during 1500-1600C
ultimately the reaction bonded silicon carbide was made. The diameter of SiC space mirror blank we have made is 680mm. If expanding the size of the vacuum furnace
bigger mirror blank can be obtained. The test results show that the mechanical and thermal properties of RB-SiC are excellent with bending strength of 350MPa
fracture toughness of 4.1 MPa·m1/2 and coefficient of thermal expansion(CET) of 2.6710-6/K. The surface roughness(RMS) could be better than 3nm.
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